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1. The act or state of adjustment or adaptation. 2. In sensorimotor theory, the alteration of schemata or cognitive expectations to conform with experience. [L. ac-commodo, pp. -atus, to adapt, fr. modus, a measure]
amplitude of a. the difference in refractivity of the eye at rest and when fully accommodated.
a. of eye the increase in thickness and convexity of the eye's lens in order to focus the image of an external object upon the retina.
histologic a. change in shape of cells to meet altered physical conditions, as the flattening of cuboidal cells in cysts as a result of pressure.pseudometaplasia;
negative a. the decrease of a. that occurs when shifting from near vision to distance vision.
a. of nerve the property of a nerve by which it adjusts to a slowly increasing strength of stimulus, so that its threshold of excitation is greater than it would be were the stimulus strength to have risen more rapidly.
positive a. increased refractivity of the eye that occurs when shifting from the distance to a near object.
range of a. the distance between an object viewed with minimal refractivity of the eye and one viewed with maximal accommodation.
relative a. quantity of a. required for single binocular vision for any specified distance, or for any particular degree of convergence.
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